https://store.steampowered.com/app/1108000
http://store.steampowered.com/app/214340/
http://store.steampowered.com/app/241910/
http://store.steampowered.com/app/421050/
http://store.steampowered.com/app/292910/
Steam account required for game activation and installation
PC System Requirements
MINIMUM:
OS:Windows XP
Processor:2.5 GHz (Single Core) or 2 GHz (Dual Core)
Memory:2 GB RAM
Graphics:OpenGL 2.0 compatible with 512 MB RAM (Shared Memory is not recommended)
DirectX®:9.0c
Hard Drive:5 GB HD space
Sound:DirectX compatible
RECOMMENDED:
OS:Windows Vista/7/8
Processor:2.5 GHz (Single Core) or 2 GHz (Dual Core)
Memory:4 GB RAM
Graphics:OpenGL 2.0 compatible with 512 MB RAM (Shared Memory is not recommended)
DirectX®:9.0c
Hard Drive:5 GB HD space
Sound:DirectX compatible
Mac System Requirements
MINIMUM:
OS:Lion (10.7)
Processor:2 GHz (Dual Core) Intel
Memory:2 GB RAM
Hard Drive:5 GB HD space
RECOMMENDED:
OS:Lion (10.7)
Processor:2 GHz (Dual Core) Intel
Memory:2 GB RAM
Hard Drive:5 GB HD space
Language Support:
Interface: English, German, Russian, Polish, French, Italian, Spanish
Full Audio: English, German, Italian, Spanish
Subtitles: English, German, Russian, Polish, French, Italian, Spanish